Secure DNS for Small Business

Every time someone on your network visits a website, opens an email link, or uses an app, a DNS request happens first. DNS is the phone book of the internet — it translates domain names like nerdsec.io into the IP addresses computers use to connect. Most businesses never think about it. Attackers do.

Secure DNS adds a layer of protection at that exact moment — before a connection is ever made. It's one of the most effective, lowest-friction security controls a small business can put in place.

What Is DNS and Why Does It Matter for Security?

When your browser wants to reach a website, it first asks a DNS server: "What's the IP address for this domain?" Standard DNS sends that question in plaintext and accepts whatever answer comes back — no verification, no filtering, no encryption. That creates several real problems:

• DNS hijacking — an attacker intercepts your DNS query and returns a malicious IP address, silently redirecting you to a fake site
• DNS spoofing — a poisoned DNS cache feeds bad responses to everyone on the network
• Surveillance — your ISP, network operator, or anyone on the same Wi-Fi can see every domain your business looks up
• Phishing — employees click a link in an email and DNS dutifully resolves the malicious domain, connecting them to the attacker's server

Secure DNS addresses all of these. Here's how.

Encrypted DNS Queries (DNS over HTTPS)

NerdSec routes your DNS traffic over an encrypted connection — the same HTTPS encryption your browser uses for secure websites. This is commonly called DNS over HTTPS (DoH) or DNS over TLS (DoT).

The practical effect: no one on your network, at your ISP, or on public Wi-Fi can see what domains your business is looking up. That shuts down a common surveillance and interception vector. It also prevents DNS hijacking, since the encrypted channel can't be tampered with in transit.

For small businesses with employees working from coffee shops, hotels, or home networks, this matters a lot. You have no control over those networks — encrypted DNS means you don't have to.

DNS Filtering — Block Malware and Phishing Before They Connect

Most DNS resolvers will happily return the IP address of a known malware distribution site, a phishing page, or a command-and-control server. They don't know any better, and they don't care.

NerdSec's Secure DNS maintains an up-to-date threat intelligence feed that tracks the reputation of domains and the IP addresses they resolve to. When a device on your network requests a known-bad domain:

• The request is blocked — no IP is returned
• The connection never happens
• The user sees a block page instead of a phishing site or malware download

This works even if the malicious link came from a legitimate-looking email, a compromised ad, or a typosquatted domain designed to look like a real site. DNS filtering catches threats that endpoint protection and email filters can miss, because it operates at the network layer and covers every device — computers, phones, printers, and smart devices alike.

Common threats blocked by DNS filtering include:

• Phishing pages and credential harvesting sites
• Malware download domains
• Ransomware command-and-control (C2) servers
• DNS tunneling — a technique attackers use to exfiltrate data or establish covert channels through DNS traffic
• Newly registered domains commonly used in attacks

AI Anomaly Detection

Threat intelligence feeds catch known-bad domains. But what about a brand-new domain registered yesterday for a targeted attack? Or malware that uses algorithmically generated domain names to contact its C2 infrastructure?

NerdSec's AI and machine-learning models analyze every DNS request on your network, building a behavioral baseline over time. When something deviates from normal — unusual query volume, suspicious domain patterns, unexpected external connections — you're alerted immediately.

This matters because sophisticated attacks specifically try to avoid known-bad domain lists. Anomaly detection catches the threats that slip through reputation-based filtering alone. It's like having a security analyst watching your DNS traffic around the clock, not just checking it against a list.

Why Small Businesses Are a Target

It's a common assumption that attackers only go after large enterprises. The reality is the opposite: small businesses are frequently targeted because they're assumed to have weaker defenses. A successful phishing attack against a 10-person company can be just as profitable as one against a larger organization — and far easier to execute.

DNS-based attacks are particularly effective against small businesses because:

• Most have no DNS filtering in place at all
• Employees use personal devices and home or public networks with no protections
• There's no dedicated IT or security team watching for anomalies
• A single compromised credential can expose the entire organization

Secure DNS closes one of the most commonly exploited gaps — without requiring an IT team to manage it.

Easy to Deploy, Easy to Manage

NerdSec Secure DNS doesn't require installing agents on every device or reconfiguring your entire network. Setup takes minutes. Once it's running, it protects every device that uses your network — automatically, in the background.

Ready to protect your network? Get started with NerdSec, or learn more about how AI-powered logging and Network Monitor can round out your security posture.